C#_格式化輸入日期時間

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CShapeTest
{
    class Start
    {
        static void Main(string[] args)
        {
            DateTime dt = System.DateTime.Now;
            Console.WriteLine("顯示系統時間：");
            String time = String.Format("{0:d}", dt) + "\n" +
                            String.Format("{0:D}", dt) + "\n" +
                            String.Format("{0:g}", dt) + "\n" +
                            String.Format("{0:M}", dt) + "\n" +
                            String.Format("{0:Y}", dt) + "\n" +
                            "目前系統時間為：" + String.Format("{0:F}", dt);
            Console.WriteLine(time);

            Console.ReadLine();
        }
    }
}